The study looked at around 100 online chess players—who have to make constant decisions—and had them fill out a questionnaire about their sleeping and eating habits, and their typical wake-up times (AKA whether they’re early-rising “larks” or late-night-loving “owls,” or somewhere in between).

The researchers hypothesized that each player would perform better based on his chronotype (in other words, if he’s an owl or a lark). Surprisingly, however, that wasn’t the case.

While both chronotypes played more games at the time of day when they were mentally peaking, they shared a similar pattern regardless: They engaged in faster decision-making later in the day, compared to slower and more accurate choices in the morning hours.

“We found that players changed their decision-making policy throughout the day: Players decide faster and less accurately as the day progresses, reaching a plateau early in the afternoon,” the researchers wrote. Anyone else setting their alarm for an earlier time tomorrow?